Stop mechanism for spinning frames



Dec. 12, 1950 M. CARRETTE 2,533,310

STOP MECHANISM FOR SPINNING FRAMES Filed July 31, 1947 Patented Dec. 12,1950 STOP MECHANISM FOR SPINNING FRAMES Maurice Carrette, Lille, France,assignor to Luwa A.-G., Zurich, Switzerland Application July 31, 1947,Serial No. 764,950 In France April 23, 1946 Section 1, Public Law 690,August 8, 1946 Patent expires April 23, 1966 6 Claims. (Cl. 57-79) Thisinvention relates to stop mechanism for spinning frames of the typedescribed in my prior application for Patent Ser, No. 707,680 ofNovember 4, 1946, now Patent No. 2,500,343, issued March 14, 1950,in-which a stop motion automatically operates under the control of asuction device by causing each sliver to pass in front of a suctionorifice before being wound on the bobbin, so that upon breakage of thesliver or production of a single, a change in suction conditions isproduced to cause actuation of the stop motion mechanism forautomatically stopping the frame.

, It is known in spinning frames to control the reversal of the bobbinrail of the frame by an oscillatory reversing bracket. Each time thisbracket effects its angular stroke a reversing of the movement of thebobbin rail is produced, and for a short period the rail is free of anyrestraint. If a breakage of the sliver occurred during this reversalperiod, actuating the stop motion, it is possible that the releasedbobbin rail would fall by operation of the force of gravity.

It is an object of the present invention to provide an automatic stopmechanism which is placed under the control of the above mentioned stopmotion to prevent stopping of the frame during an extremely short periodwhen the bobbin rail is released at both ends of its stroke, and this atany amplitude of its stroke.

Other objects and advantages of the present invention will be apparentfrom the following specification by reference to the accompanyingdrawings, in which Fig. 1 is a fragmentary view in elevation of a rovingframe having a stop mechanism according to the invention.

Fig. 2 represents the reversing bracket with the contact of theautomatic stopping device according to Fig. 1 in an intermediateposition of opera.- tion, in which the stop is operative.

Figs. 3 and 4 show a modified reversing bracket in two positions ofoperations.

Referring to Figs. 1 and 2 the slivers I are fed by the roller 2 andwound up on bobbins 3 after passing before suction orifices 4 of asuction conduit 5 connected to a suction fan 6.

The suction conduit is formed with an enlarged cylindrical portion 1 inwhich can reciprocate a piston 8 having holes 8. This piston 8 is guidedby a rod 9 which projects outwardly from the cylinder and on the end ofwhich is hingedly mounted on a pin I0 a lever l I pivoting on a fixedaxis l2 and carrying a mercury switch 13. This switch is disposed in thecircuit ll of a coil of 2 an electromagnet l'5 adapted to attract a rodl5 which is normally locked by a bolt I1 and hingedly connected at l8 toanother lever 19. This lever I9 is pivoted on a fixed axis"20 and urgedto turn in the direction of the arrow f for example by a counterweight2| or by a. spring or other suitable means.

The lever l9 bears against a shoulder 22 of a. releasing bar 23connected to the shift fork 24 which is adapted to cause a driving beltnot shown to pass from a driving pulley 25 to a loose pu ley 26 of theframe.

The stop motion mechanism is completed by a lever 21 pivoting on a fixedaxis 28. This lever is engaged by means of a slot 21 on a pin 29 of thebar 23. Its other end is hingedly connected at 30 to a'pawl 3i havingone end formed as hook 32 adapted to cooperate with a projection 33 onthe piston rod 9, while the opposite end of the pawl 3| cooperates withan inclined surface 34 formed externally on the bottom of the cylinder1.

The operation of the stop motion is as follows:

When a sliver l breaks, the material delivered by the roller 2' isimmediately drawn into the suction conduit 5 by the suction of the fan 6and it cannot mix up with the adjacent rovings. When a single isproduced, it is also sucked into the conduit 5 after a very short time.

When the material of the broken slivers is introduced into the suctionconduit 5 it is drawn towards the piston 8 and produces plugging of theholes 8" of the piston. The suction of the fan 6 then produces adifference in pressure on opposite sides of the piston 8 in the cylinderI which pressure difference causes the piston to move in thedirection ofthe arrow ;f"-.

The rod 9 then acts on the lever H to oscillate the lever about its axisl2 and close the electric circuit M by tilting the mercury switch l3 tohorizontal position. Closing of the electric circuit l4 energizes thecoil l5 which attracts the rod l6 and disengages it from the bolt I! soas to release the lever l9. This lever, owing to the action of thecounterweight 21 turns on its pivot 20 and moves the releasing barand'the shift fork 24 in the direction of the arrow 1 so as to cause thedriving belt to pass from the fixed pulley 25 to the loose pulley 26.

Owing to the movement of the releasing bar 23 the lever :21 is rockedabout the pivot 23, the end of the lever 21 carrying the pawl 3| ismoved towards the left in Fig. 1 and the rear end of the pawl abandonsthe inclined surface 34 and the pawl rocks about the axis 30, so thatthe front end portion of the pawl arm comes to rest on the projection 33On the rod 9, whereby the book 32 reaches over the projection on theleft side thereof.

Closing of the electric circuit H can produce in any conventional mannera signal, for example a mechanical or a luminous or ,sonorous signal todraw the attention of the operator to the fact that the frame hasstopped and to particularly designate the machine on which the stopoccurred among a group of similar machines.

When the operator has pieced-up the broken sliver I or eliminated thesingle, the frame is started up again. For this purpose the'releasingbar 23 is moved in the direction opposite to the arrow I By theintermediary oi the lever 21 pivoting on the fixed axis 28, this bar 23moves the hook 32 engaged on the projection 33 of the piston rod 9. Thepiston is thus returned to its operating position and is ready tooperate again. At the end of the returning movement the pawl 3| engageswith its end the inclined surface 34, so that the pawl is forced to tiltthereby causing the hook to disengage the projection 33 of the rod 3.The piston 8 which is now entirely free again can move in the directionof the arrow ,f", as soon as a new breakage of the sliver I occurs.

The mechanism so far described is claimed in my above mentioned priorapplication and does not form a part of the present invention.

The bobbin spindles 60 are carried by the vertically movable lbobbinrail 6|. The change of direction at the two ends of the stroke of therail are obtained in well known manner by a reversing bracket which isconstituted by a member 62 oscillatably mounted on an axis 63 andeffecting an angular displacement m which is always of v the same extentfor any length of stroke of the rail 6l.- The bracket 62 is providedwith two 'eyelets 64 through which can slide a rod 65. The end of thisrod carries a pin 66 engaged in a guide slot 61 formed on the rail 6|.From the beginning until the end of forming the bobbins 3, the pin 66advances at each stroke of the rail M in the guide slot 61 in thedirection of the arrow 7 The distance L becomes shorter with anysuccessive vstroke and the rail makes continuously reduced movementswhile the bracket 62 always eflfects the same angular movement, it.

According to the present invention the bracket 62 is provided with twoadjustable abutments 68 and 69 adapted to alternatively bear against theswitches and II, respectively, which are mounted like pendulums on theaxes l2 and 13, respectively.

These switches are disposed in series in the electric circuit 14together with the switch I3 of the automatic stop motionabove described.

The operation of the automatic stopping device is as follows:

When the rail 6! is not at the end of its stroke (Fig. 2) the switches10 and II are maintained by gravity in a position in which the electriccircuit is established at these switches and accordingly can be closedwhen the switch 13 is actuated by the piston 8 upon breakage of a sliverI.

However, when the rail Si is at one end of its stroke (Fig. 1) so thatone of the abutments 68 or 69 bears against a switch 10 or I I, thecircuit I4 is interrupted at the engaged switch and the switch [3 of theautomatic stop motion cannot produce the closure of the circuit, and themovement of the frame cannot be stopped until the abutment 68 and G9 hasreleased the engaged switch III or II.

for one oscillation of the bracket 63, each time.

the bobbin rail 6| moves up or down. The pinion I4 is rigidly connectedto a lever I5 which at the end of each stroke causes the switch 16 totilt about the fixed axis 'I'I in one or the-other direction so as toopen the circuit ll at each end of the stroke.

The opening periods may be modified either by changing the number ofteeth of the pinion 14 or by changing the diameter of the contactingroller 18 at the end of the lever 15.

The shapes of the switches forming pendulums and of the members whichmove them are preferably s0 chosen that the period during which anautomatic cut-out of the frame drive is impossible is as short aspossible and comprises the instant during which the reversal of themovement of the bobbin rail is eflected.

I claim:

1. In a spinning frame having a stop motion, the combination ofelectromagnetic means operative to initiate actuation of said stopmotion, a bobbin carrying rail adapted to reciprocate substantially inthe direction of the axis of the bobbin spindles, a suction conduitprovided with a series of suction orifices, means for feeding a sliverin front of each suction orifice to said bobbins, means movable withinthe suction conduit in response to change in suction conditions therein,said electromagnetic means becoming operative upon displacement of saidmovable means due to a change in suction conditions in said conduit whena sliver breaks or a single is produced and broken sliver is drawn intothe suction conduit, and means preventing said electromagnetic meansfrom becoming operative when said bobbin rail is substantially at eitherend of its course.

2. In a spinning frame having a stop motion, a suction conduit providedwith a series of suction orifices, a bobbin rail adapted to reciprocatesubstantially in the direction of the axes of the bobbin spindles, meansfor feeding a sliver to each of said bobbins, said suction orificesbeing each disposed-in proximity of the path of a sliver passing to a,bobbin whereby when a sliver is broken, the broken sliver will be drawninto the suction conduit, a wall member permeable to air movablydisposed in said suction conduit and adapted to create difference inpressure acting at opposite sides of said permeable wall member in thesuction conduit when material of a broken sliver accumulates at one faceof said well member and changes its permeability, electromagnetic meansoperative upon a pressuredifierence being so created to operate saidstop motion, and means preventing said electromagnetic means frombecoming operative when said bobbin rail is substantially at either endof its course.

3. Ina spinning frame having a stop motion, a suction conduit providedwith a series of suction orifices, a bobbin rail adapted to reciprocatesubstantially in the direction of the axes of the bobbin spindles, meansfor feeding a sliver to each of said bobbins, said suction orificesbeing each disposed in proximity of the path of a sliver passing to abobbin whereby when a sliver is broken, the broken sliver will be drawninto the suction conduit, a wall member permeable to air movablydisposed in said suction conduit and adapted to'create a difl'erence inpressure acting at opposite sides of said permeable wall member in thesuction conduit when material of a broken sliver accumulates at one faceof said wall member and changes its permeability, electromagnetic meansoperative upon a pressure difference being so created to operate saidstop motion, a switch disposed in series in the circuit of saidelectromagnetic means, and an actuating member for said switch operatedby said reciprocating bobbin rail to open the switch when the bobbinrail is substantially at the end of its course, to prevent operation ofsaid electromagnetic means during reversal of the bobbin rail movement.

4. A spinning frame as defined in claim 3, wherein said actuating memberfor the switch connected in the circuit oi. the electromagnetic stopmotion operating means is constituted by the reversing bracketcontrolling the reversal of the bobbin rail movement.

5. A spinning frame as defined in claim 3, wherein said switch actuatingmember is constituted by the reversing bracket controlling the reversalof the bobbin rail movement, said bracket having two adjustableabutments cooperating each with a switch mounted in series in thecircuit of said electromagnetic stop motion operating means to open thecircuit during reversal of the bobbin rail movement.

6. A spinning frame as defined in claim 3, wherein said switch actuatingmember is constituted by the reversing bracket controlling the reversalof the bobbin rail movement, said bracket having a toothed sector, a pinmeshing with said sector, and a switch operating arm moving with saidpinion to actuate said switch during reversal of the bobbin railmovement.

MAURICE cARREi'rn No references cited.

